Answer:
The statement that is an opinion is number 3.
Step-by-step explanation:
Statements 1, 2, and 4 are related between them because they talked about how women worked for social change and that paved the way for a new era.
Statement 3 looks like an opinion because it is not related to the other statements and, if you delete that part the sentences would remain with its meaning.
I hope this answer helps you